Fate of the nitrogen from fertilizers in field - grown maize
The nitrogen [N] from fertilizers has different fate, some of which affect the environment or the human health, e. g. nitrates in groundwater. We determined the fate [plant organs, soil organic matter, remaining nitrates and volatilization] of the N applied to field-grown direct drilling maize. An e...
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| Otros Autores: | , |
| Formato: | Artículo |
| Lenguaje: | Inglés |
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| Acceso en línea: | http://ri.agro.uba.ar/files/intranet/articulo/2012RimskiKorsakov.pdf LINK AL EDITOR |
| Aporte de: | Registro referencial: Solicitar el recurso aquí |
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| 245 | 0 | 0 | |a Fate of the nitrogen from fertilizers in field - grown maize |
| 520 | |a The nitrogen [N] from fertilizers has different fate, some of which affect the environment or the human health, e. g. nitrates in groundwater. We determined the fate [plant organs, soil organic matter, remaining nitrates and volatilization] of the N applied to field-grown direct drilling maize. An experiment was carried out in a Typic Argiudoll at Chivilcoy, Argentina [35º02'S, 60º06'W]. Treatments were: control; 70; 140 and 250 kg N ha -1. Microplots were fertilized with urea tagged with 15N [1.5 percent abundance]. Plant biomass and N concentration were determined at flowering and at physiological maturity. Soil organic N [0-30 cm] and nitrates and ammoniacal N concentrations [0-300 cm] at harvest, and ammonia volatilization were determined. 15N was determined in all samples. The crop was the main sink, recovering an average of 56 percent of the N from the fertilizer. Both the soil organic fraction and ammonia volatilization were the second N sink. The N remaining as residual nitrates averaged 8.6 percent and the leached nitrates were only 0.8 percent of the fertilizer applied. Most N leached after maize cropping could be accredited to mineralization of organic N. Organic matter could then be a temporary sink, which reduces N leaching from a single fertilization but releases nitrates the following years. | ||
| 653 | 0 | |a MAIZE | |
| 653 | 0 | |a NITRATE LEACHING | |
| 653 | 0 | |a NITRATES | |
| 653 | 0 | |a ORGANIC FRACTIONS | |
| 653 | 0 | |a TAGGED NITROGEN | |
| 653 | 0 | |a VOLATILIZATION | |
| 653 | 0 | |a CONCENTRATION [COMPOSITION] | |
| 653 | 0 | |a DIRECT DRILLING | |
| 653 | 0 | |a ENVIRONMENTAL FATE | |
| 653 | 0 | |a FERTILIZER APPLICATION | |
| 653 | 0 | |a GROUNDWATER | |
| 653 | 0 | |a LEACHING | |
| 653 | 0 | |a MINERALIZATION | |
| 653 | 0 | |a NITRATE | |
| 653 | 0 | |a PHYTOMASS | |
| 653 | 0 | |a SOIL ORGANIC MATTER | |
| 653 | 0 | |a SOURCE-SINK DYNAMICS | |
| 653 | 0 | |a ARGENTINA | |
| 653 | 0 | |a BUENOS AIRES [ARGENTINA] | |
| 653 | 0 | |a CHIVILCOY | |
| 653 | 0 | |a ZEA MAYS | |
| 700 | 1 | |9 6390 |a Rubio, Gerardo | |
| 700 | 1 | |9 24365 |a Lavado, Raúl Silvio | |
| 773 | |t Nutrient Cycling in Agroecosystems |g Vol.93, no.3 (2012), p.253-263 | ||
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| 900 | |a ^tFate of the nitrogen from fertilizers in field-grown maize | ||
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| 900 | |a Vol. 93, no. 3 | ||
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| 900 | |a MAIZE | ||
| 900 | |a NITRATE LEACHING | ||
| 900 | |a NITRATES | ||
| 900 | |a ORGANIC FRACTIONS | ||
| 900 | |a TAGGED NITROGEN | ||
| 900 | |a VOLATILIZATION | ||
| 900 | |a CONCENTRATION [COMPOSITION] | ||
| 900 | |a DIRECT DRILLING | ||
| 900 | |a ENVIRONMENTAL FATE | ||
| 900 | |a FERTILIZER APPLICATION | ||
| 900 | |a GROUNDWATER | ||
| 900 | |a LEACHING | ||
| 900 | |a MINERALIZATION | ||
| 900 | |a NITRATE | ||
| 900 | |a PHYTOMASS | ||
| 900 | |a SOIL ORGANIC MATTER | ||
| 900 | |a SOURCE-SINK DYNAMICS | ||
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| 900 | |a CHIVILCOY | ||
| 900 | |a ZEA MAYS | ||
| 900 | |a The nitrogen [N] from fertilizers has different fate, some of which affect the environment or the human health, e. g. nitrates in groundwater. We determined the fate [plant organs, soil organic matter, remaining nitrates and volatilization] of the N applied to field-grown direct drilling maize. An experiment was carried out in a Typic Argiudoll at Chivilcoy, Argentina [35º02'S, 60º06'W]. Treatments were: control; 70; 140 and 250 kg N ha -1. Microplots were fertilized with urea tagged with 15N [1.5 percent abundance]. Plant biomass and N concentration were determined at flowering and at physiological maturity. Soil organic N [0-30 cm] and nitrates and ammoniacal N concentrations [0-300 cm] at harvest, and ammonia volatilization were determined. 15N was determined in all samples. The crop was the main sink, recovering an average of 56 percent of the N from the fertilizer. Both the soil organic fraction and ammonia volatilization were the second N sink. The N remaining as residual nitrates averaged 8.6 percent and the leached nitrates were only 0.8 percent of the fertilizer applied. Most N leached after maize cropping could be accredited to mineralization of organic N. Organic matter could then be a temporary sink, which reduces N leaching from a single fertilization but releases nitrates the following years. | ||
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